Current statins show calcium channel blocking activity through voltage gated channels

Area of Science:

• Pharmacology
• Gastroenterology
• Cardiovascular Medicine

Background:

• Statins are widely prescribed for hypercholesterolemia.
• Common adverse effects include muscle pain, weakness, and gastrointestinal disturbances.
• The precise mechanisms underlying these side effects require further elucidation.

Purpose of the Study:

• To investigate the effects of common statins on gastrointestinal smooth muscle.
• To determine if statins exhibit calcium channel blocking activity in the gastrointestinal tract.
• To explore the potential link between statin-induced calcium channel blockade and adverse effects.

Main Methods:

• Isolated rabbit jejunal preparations were used to assess spontaneous and KCl-induced contractions.
• Various concentrations of simvastatin, atorvastatin, fluvastatin, and rosuvastatin were applied.
• Calcium Concentration Response Curves (CCRCs) were constructed in the presence and absence of statins and compared to verapamil, a known calcium channel blocker.

Main Results:

• All tested statins (simvastatin, atorvastatin, fluvastatin, rosuvastatin) demonstrated relaxant effects on both spontaneous and KCl-induced jejunal contractions.
• Statins caused a significant rightward shift in the IC50 of CCRCs, similar to the effect of verapamil.
• These findings indicate that statins possess calcium antagonistic properties.

Conclusions:

• The study suggests that statins exert calcium antagonistic effects on voltage-gated calcium channels in gastrointestinal smooth muscle.
• This calcium channel blocking activity may contribute to the observed muscle weakness and gastrointestinal disorders associated with statin use.
• These findings provide a potential pharmacological explanation for specific statin-related adverse events.